
The decimal numeric system counts from minus infinity to
infinity. This means that numbers are usually negative or positive,
depending on their position from 0, which is considered as neutral. In some
operations, the number considered will need to be only positive even if it
is provided in a negative format. The absolute value of a number x is x if
the number is (already) positive. If the number is negative, its absolute
value is its positive equivalent. For example, the absolute value of 12 is
12, while the absolute value of –12 is 12.

To get the absolute value of a number, you can use one
of the C/C++ abs() function. Its syntax is:
int abs(int x);
This function takes an integer as the argument and
returns its absolute value equivalent. Here is an example:
//
void __fastcall TForm1::btnAbsoluteClick(TObject *Sender)
{
int Number = Edit1>Text.ToInt();
Edit2>Text = abs(Number);
}
//
If you want to find the absolute value of a number
that is larger than the regular integer, you can use the labs() function.
Its syntax is:
long labs(long int x);
This function takes a long integer as argument and
returns its equivalent absolute value:
//
void __fastcall TForm1::btnLongAbsoluteClick(TObject *Sender)
{
int Longer = StrToInt(edtNumber>Text);
edtResult>Text = labs(Longer);
}
//